ref: 9c1b473ae274c097e81c1dff285e089edafddc5c
dir: /r_alias.c/
#include "quakedef.h"
#define LIGHT_MIN 5 // lowest light value we'll allow, to avoid the
// need for inner-loop light clamping
affinetridesc_t r_affinetridesc;
// TODO: these probably will go away with optimized rasterization
finalvert_t *pfinalverts;
static mdl_t *pmdl;
static vec3_t r_plightvec;
static int r_ambientlight[3];
static float r_shadelight[3];
static aliashdr_t *paliashdr;
static float ziscale;
static model_t *pmodel;
static vec3_t alias_forward, alias_right, alias_up;
static maliasskindesc_t *pskindesc;
static int a_skinwidth;
static int r_anumverts;
static float aliastransform[3][4];
typedef struct {
int index0;
int index1;
} aedge_t;
static const aedge_t aedges[12] = {
{0, 1}, {1, 2}, {2, 3}, {3, 0},
{4, 5}, {5, 6}, {6, 7}, {7, 4},
{0, 5}, {1, 4}, {2, 7}, {3, 6}
};
const float r_avertexnormals[NUMVERTEXNORMALS][3] = {
#include "anorms.h"
};
static void R_AliasSetUpTransform (int trivial_accept);
static void R_AliasTransformVector (vec3_t in, vec3_t out);
static void R_AliasTransformFinalVert (finalvert_t *fv, auxvert_t *av, trivertx_t *pverts, stvert_t *pstverts);
void R_AliasProjectFinalVert (finalvert_t *fv, auxvert_t *av);
/*
================
R_AliasCheckBBox
================
*/
bool R_AliasCheckBBox (void)
{
int i, flags, frame, numv;
aliashdr_t *pahdr;
float zi, basepts[8][3], v0, v1, frac;
finalvert_t *pv0, *pv1, viewpts[16];
auxvert_t *pa0, *pa1, viewaux[16];
maliasframedesc_t *pframedesc;
bool zclipped, zfullyclipped;
unsigned anyclip, allclip;
int minz;
// expand, rotate, and translate points into worldspace
currententity->trivial_accept = 0;
pmodel = currententity->model;
pahdr = Mod_Extradata (pmodel);
pmdl = (mdl_t *)((byte *)pahdr + pahdr->model);
R_AliasSetUpTransform (0);
// construct the base bounding box for this frame
frame = currententity->frame;
// TODO: don't repeat this check when drawing?
if ((frame >= pmdl->numframes) || (frame < 0))
{
Con_DPrintf("No such frame %d %s\n", frame, pmodel->name);
frame = 0;
}
pframedesc = &pahdr->frames[frame];
// x worldspace coordinates
basepts[0][0] = basepts[1][0] = basepts[2][0] = basepts[3][0] =
(float)pframedesc->bboxmin.v[0];
basepts[4][0] = basepts[5][0] = basepts[6][0] = basepts[7][0] =
(float)pframedesc->bboxmax.v[0];
// y worldspace coordinates
basepts[0][1] = basepts[3][1] = basepts[5][1] = basepts[6][1] =
(float)pframedesc->bboxmin.v[1];
basepts[1][1] = basepts[2][1] = basepts[4][1] = basepts[7][1] =
(float)pframedesc->bboxmax.v[1];
// z worldspace coordinates
basepts[0][2] = basepts[1][2] = basepts[4][2] = basepts[5][2] = (float)pframedesc->bboxmin.v[2];
basepts[2][2] = basepts[3][2] = basepts[6][2] = basepts[7][2] = (float)pframedesc->bboxmax.v[2];
zclipped = false;
zfullyclipped = true;
minz = Q_MAXINT;
for (i=0; i<8 ; i++)
{
R_AliasTransformVector (&basepts[i][0], &viewaux[i].fv[0]);
if (viewaux[i].fv[2] < ALIAS_Z_CLIP_PLANE)
{
// we must clip points that are closer than the near clip plane
viewpts[i].flags = ALIAS_Z_CLIP;
zclipped = true;
}
else
{
if (viewaux[i].fv[2] < minz)
minz = viewaux[i].fv[2];
viewpts[i].flags = 0;
zfullyclipped = false;
}
}
if (zfullyclipped)
{
return false; // everything was near-z-clipped
}
numv = 8;
if (zclipped)
{
// organize points by edges, use edges to get new points (possible trivial reject)
for (i=0 ; i<12 ; i++)
{
// edge endpoints
pv0 = &viewpts[aedges[i].index0];
pv1 = &viewpts[aedges[i].index1];
pa0 = &viewaux[aedges[i].index0];
pa1 = &viewaux[aedges[i].index1];
// if one end is clipped and the other isn't, make a new point
if (pv0->flags ^ pv1->flags)
{
frac = (ALIAS_Z_CLIP_PLANE - pa0->fv[2]) /
(pa1->fv[2] - pa0->fv[2]);
viewaux[numv].fv[0] = pa0->fv[0] +
(pa1->fv[0] - pa0->fv[0]) * frac;
viewaux[numv].fv[1] = pa0->fv[1] +
(pa1->fv[1] - pa0->fv[1]) * frac;
viewaux[numv].fv[2] = ALIAS_Z_CLIP_PLANE;
viewpts[numv].flags = 0;
numv++;
}
}
}
// project the vertices that remain after clipping
anyclip = 0;
allclip = ALIAS_XY_CLIP_MASK;
// TODO: probably should do this loop in ASM, especially if we use floats
for (i=0 ; i<numv ; i++)
{
// we don't need to bother with vertices that were z-clipped
if (viewpts[i].flags & ALIAS_Z_CLIP)
continue;
zi = 1.0 / viewaux[i].fv[2];
// FIXME: do with chop mode in ASM, or convert to float
v0 = (viewaux[i].fv[0] * xscale * zi) + xcenter;
v1 = (viewaux[i].fv[1] * yscale * zi) + ycenter;
flags = 0;
if (v0 < r_refdef.fvrectx)
flags |= ALIAS_LEFT_CLIP;
if (v1 < r_refdef.fvrecty)
flags |= ALIAS_TOP_CLIP;
if (v0 > r_refdef.fvrectright)
flags |= ALIAS_RIGHT_CLIP;
if (v1 > r_refdef.fvrectbottom)
flags |= ALIAS_BOTTOM_CLIP;
anyclip |= flags;
allclip &= flags;
}
if (allclip)
return false; // trivial reject off one side
currententity->trivial_accept = !anyclip & !zclipped;
if (currententity->trivial_accept)
{
if (minz > (r_aliastransition + (pmdl->size * r_resfudge)))
{
currententity->trivial_accept |= 2;
}
}
return true;
}
/*
================
R_AliasTransformVector
================
*/
static void R_AliasTransformVector (vec3_t in, vec3_t out)
{
out[0] = DotProduct(in, aliastransform[0]) + aliastransform[0][3];
out[1] = DotProduct(in, aliastransform[1]) + aliastransform[1][3];
out[2] = DotProduct(in, aliastransform[2]) + aliastransform[2][3];
}
/*
================
R_AliasPreparePoints
General clipped case
================
*/
void R_AliasPreparePoints (trivertx_t *apverts, auxvert_t *auxverts, pixel_t *colormap)
{
int i;
stvert_t *pstverts;
finalvert_t *fv;
mtriangle_t *ptri;
finalvert_t *pfv[3];
auxvert_t *av;
pstverts = (stvert_t *)((byte *)paliashdr + paliashdr->stverts);
r_anumverts = pmdl->numverts;
fv = pfinalverts;
av = auxverts;
for (i=0 ; i<r_anumverts ; i++, fv++, av++, apverts++, pstverts++)
{
R_AliasTransformFinalVert (fv, av, apverts, pstverts);
if (av->fv[2] < ALIAS_Z_CLIP_PLANE)
fv->flags |= ALIAS_Z_CLIP;
else
{
R_AliasProjectFinalVert (fv, av);
if (fv->u < r_refdef.aliasvrect.x)
fv->flags |= ALIAS_LEFT_CLIP;
if (fv->v < r_refdef.aliasvrect.y)
fv->flags |= ALIAS_TOP_CLIP;
if (fv->u > r_refdef.aliasvrectright)
fv->flags |= ALIAS_RIGHT_CLIP;
if (fv->v > r_refdef.aliasvrectbottom)
fv->flags |= ALIAS_BOTTOM_CLIP;
}
}
// clip and draw all triangles
r_affinetridesc.numtriangles = 1;
ptri = (mtriangle_t *)((byte *)paliashdr + paliashdr->triangles);
for (i=0 ; i<pmdl->numtris ; i++, ptri++)
{
pfv[0] = &pfinalverts[ptri->vertindex[0]];
pfv[1] = &pfinalverts[ptri->vertindex[1]];
pfv[2] = &pfinalverts[ptri->vertindex[2]];
if ( pfv[0]->flags & pfv[1]->flags & pfv[2]->flags & (ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP) )
continue; // completely clipped
if ( ! ( (pfv[0]->flags | pfv[1]->flags | pfv[2]->flags) &
(ALIAS_XY_CLIP_MASK | ALIAS_Z_CLIP) ) )
{ // totally unclipped
r_affinetridesc.pfinalverts = pfinalverts;
r_affinetridesc.ptriangles = ptri;
D_PolysetDraw (colormap);
}
else
{ // partially clipped
R_AliasClipTriangle (ptri, auxverts);
}
}
}
/*
================
R_AliasSetUpTransform
================
*/
static void R_AliasSetUpTransform (int trivial_accept)
{
int i;
float rotationmatrix[3][4], t2matrix[3][4];
static float tmatrix[3][4];
static float viewmatrix[3][4];
vec3_t angles;
// TODO: should really be stored with the entity instead of being reconstructed
// TODO: should use a look-up table
// TODO: could cache lazily, stored in the entity
angles[ROLL] = currententity->angles[ROLL];
angles[PITCH] = -currententity->angles[PITCH];
angles[YAW] = currententity->angles[YAW];
AngleVectors (angles, alias_forward, alias_right, alias_up);
tmatrix[0][0] = pmdl->scale[0];
tmatrix[1][1] = pmdl->scale[1];
tmatrix[2][2] = pmdl->scale[2];
tmatrix[0][3] = pmdl->scale_origin[0];
tmatrix[1][3] = pmdl->scale_origin[1];
tmatrix[2][3] = pmdl->scale_origin[2];
// TODO: can do this with simple matrix rearrangement
for (i=0 ; i<3 ; i++)
{
t2matrix[i][0] = alias_forward[i];
t2matrix[i][1] = -alias_right[i];
t2matrix[i][2] = alias_up[i];
}
t2matrix[0][3] = -modelorg[0];
t2matrix[1][3] = -modelorg[1];
t2matrix[2][3] = -modelorg[2];
// FIXME: can do more efficiently than full concatenation
R_ConcatTransforms (t2matrix, tmatrix, rotationmatrix);
// TODO: should be global, set when vright, etc., set
VectorCopy (vright, viewmatrix[0]);
VectorCopy (vup, viewmatrix[1]);
VectorInverse (viewmatrix[1]);
VectorCopy (vpn, viewmatrix[2]);
// viewmatrix[0][3] = 0;
// viewmatrix[1][3] = 0;
// viewmatrix[2][3] = 0;
R_ConcatTransforms (viewmatrix, rotationmatrix, aliastransform);
// do the scaling up of x and y to screen coordinates as part of the transform
// for the unclipped case (it would mess up clipping in the clipped case).
// Also scale down z, so 1/z is scaled 31 bits for free, and scale down x and y
// correspondingly so the projected x and y come out right
// FIXME: make this work for clipped case too?
if (trivial_accept)
{
for (i=0 ; i<4 ; i++)
{
aliastransform[0][i] *= aliasxscale *
(1.0 / ((float)0x8000 * 0x10000));
aliastransform[1][i] *= aliasyscale *
(1.0 / ((float)0x8000 * 0x10000));
aliastransform[2][i] *= 1.0 / ((float)0x8000 * 0x10000);
}
}
}
/*
================
R_AliasTransformFinalVert
================
*/
static void R_AliasTransformFinalVert (finalvert_t *fv, auxvert_t *av, trivertx_t *pverts, stvert_t *pstverts)
{
float lightcos;
av->fv[0] = DotProduct_(pverts->v, aliastransform[0]) + aliastransform[0][3];
av->fv[1] = DotProduct_(pverts->v, aliastransform[1]) + aliastransform[1][3];
av->fv[2] = DotProduct_(pverts->v, aliastransform[2]) + aliastransform[2][3];
fv->s = pstverts->s;
fv->t = pstverts->t;
fv->flags = pstverts->onseam;
// lighting
lightcos = DotProduct(r_avertexnormals[pverts->lightnormalindex], r_plightvec);
fv->l[0] = r_ambientlight[0];
fv->l[1] = r_ambientlight[1];
fv->l[2] = r_ambientlight[2];
if (lightcos < 0)
{
fv->l[0] += r_shadelight[0] * lightcos;
fv->l[1] += r_shadelight[1] * lightcos;
fv->l[2] += r_shadelight[2] * lightcos;
// clamp; because we limited the minimum ambient and shading light, we
// don't have to clamp low light, just bright
fv->l[0] = max(0, fv->l[0]);
fv->l[1] = max(0, fv->l[1]);
fv->l[2] = max(0, fv->l[2]);
}
}
/*
================
R_AliasTransformAndProjectFinalVerts
================
*/
void R_AliasTransformAndProjectFinalVerts (finalvert_t *fv, stvert_t *pstverts, trivertx_t *pverts)
{
int i;
float lightcos, zi;
for (i=0 ; i<r_anumverts ; i++, fv++, pverts++, pstverts++)
{
// transform and project
zi = 1.0 / (DotProduct_(pverts->v, aliastransform[2]) + aliastransform[2][3]);
// x, y, and z are scaled down by 1/2**31 in the transform, so 1/z is
// scaled up by 1/2**31, and the scaling cancels out for x and y in the
// projection
fv->zi = zi;
fv->u = ((DotProduct_(pverts->v, aliastransform[0]) + aliastransform[0][3]) * zi) + aliasxcenter;
fv->v = ((DotProduct_(pverts->v, aliastransform[1]) + aliastransform[1][3]) * zi) + aliasycenter;
fv->s = pstverts->s;
fv->t = pstverts->t;
fv->flags = pstverts->onseam;
// lighting
lightcos = DotProduct(r_avertexnormals[pverts->lightnormalindex], r_plightvec);
fv->l[0] = r_ambientlight[0];
fv->l[1] = r_ambientlight[1];
fv->l[2] = r_ambientlight[2];
if (lightcos < 0)
{
fv->l[0] += r_shadelight[0] * lightcos;
fv->l[1] += r_shadelight[1] * lightcos;
fv->l[2] += r_shadelight[2] * lightcos;
// clamp; because we limited the minimum ambient and shading light, we
// don't have to clamp low light, just bright
fv->l[0] = max(0, fv->l[0]);
fv->l[1] = max(0, fv->l[1]);
fv->l[2] = max(0, fv->l[2]);
}
}
}
/*
================
R_AliasProjectFinalVert
================
*/
void R_AliasProjectFinalVert (finalvert_t *fv, auxvert_t *av)
{
float zi;
// project points
zi = 1.0 / av->fv[2];
fv->zi = zi * ziscale;
fv->u = (av->fv[0] * aliasxscale * zi) + aliasxcenter;
fv->v = (av->fv[1] * aliasyscale * zi) + aliasycenter;
}
/*
================
R_AliasPrepareUnclippedPoints
================
*/
void R_AliasPrepareUnclippedPoints (trivertx_t *pverts, pixel_t *colormap)
{
stvert_t *pstverts;
finalvert_t *fv;
pstverts = (stvert_t *)((byte *)paliashdr + paliashdr->stverts);
r_anumverts = pmdl->numverts;
// FIXME: just use pfinalverts directly?
fv = pfinalverts;
R_AliasTransformAndProjectFinalVerts (fv, pstverts, pverts);
if (r_affinetridesc.drawtype)
D_PolysetDrawFinalVerts (fv, r_anumverts, colormap, currententity->alpha);
r_affinetridesc.pfinalverts = pfinalverts;
r_affinetridesc.ptriangles = (mtriangle_t *)((byte *)paliashdr + paliashdr->triangles);
r_affinetridesc.numtriangles = pmdl->numtris;
D_PolysetDraw (colormap);
}
/*
===============
R_AliasSetupSkin
===============
*/
void R_AliasSetupSkin (void)
{
int skinnum;
int i, numskins;
maliasskingroup_t *paliasskingroup;
float *pskinintervals, fullskininterval;
float skintargettime, skintime;
skinnum = currententity->skinnum;
if ((skinnum >= pmdl->numskins) || (skinnum < 0))
{
Con_DPrintf("R_AliasSetupSkin: no such skin # %d\n", skinnum);
skinnum = 0;
}
pskindesc = ((maliasskindesc_t *)
((byte *)paliashdr + paliashdr->skindesc)) + skinnum;
a_skinwidth = pmdl->skinwidth;
if (pskindesc->type == ALIAS_SKIN_GROUP)
{
paliasskingroup = (maliasskingroup_t *)((byte *)paliashdr +
pskindesc->skin);
pskinintervals = (float *)
((byte *)paliashdr + paliasskingroup->intervals);
numskins = paliasskingroup->numskins;
fullskininterval = pskinintervals[numskins-1];
skintime = cl.time + currententity->syncbase;
// when loading in Mod_LoadAliasSkinGroup, we guaranteed all interval
// values are positive, so we don't have to worry about division by 0
skintargettime = skintime -
((int)(skintime / fullskininterval)) * fullskininterval;
for (i=0 ; i<(numskins-1) ; i++)
{
if (pskinintervals[i] > skintargettime)
break;
}
pskindesc = &paliasskingroup->skindescs[i];
}
r_affinetridesc.pskindesc = pskindesc;
r_affinetridesc.pskin = (void *)((byte *)paliashdr + pskindesc->skin);
r_affinetridesc.skinwidth = a_skinwidth;
r_affinetridesc.seamfixupX16 = (a_skinwidth >> 1) << 16;
r_affinetridesc.skinheight = pmdl->skinheight;
}
/*
================
R_AliasSetupLighting
================
*/
void R_AliasSetupLighting (alight_t *plighting)
{
int i;
// guarantee that no vertex will ever be lit below LIGHT_MIN, so we don't have
// to clamp off the bottom
for(i = 0; i < 3; i++){
r_ambientlight[i] = plighting->ambientlight[i];
if (r_ambientlight[i] < LIGHT_MIN)
r_ambientlight[i] = LIGHT_MIN;
r_ambientlight[i] = (255 - r_ambientlight[i]) << VID_CBITS;
if (r_ambientlight[i] < LIGHT_MIN)
r_ambientlight[i] = LIGHT_MIN;
r_shadelight[i] = plighting->shadelight[i];
if (r_shadelight[i] < 0)
r_shadelight[i] = 0;
r_shadelight[i] *= VID_GRADES;
}
// rotate the lighting vector into the model's frame of reference
r_plightvec[0] = DotProduct(plighting->plightvec, alias_forward);
r_plightvec[1] = -DotProduct(plighting->plightvec, alias_right);
r_plightvec[2] = DotProduct(plighting->plightvec, alias_up);
}
/*
=================
R_AliasSetupFrame
set r_apverts
=================
*/
trivertx_t *R_AliasSetupFrame (void)
{
int frame;
int i, numframes;
maliasgroup_t *paliasgroup;
float *pintervals, fullinterval, targettime, time;
frame = currententity->frame;
if ((frame >= pmdl->numframes) || (frame < 0))
{
Con_DPrintf("R_AliasSetupFrame: no such frame %d\n", frame);
frame = 0;
}
if (paliashdr->frames[frame].type == ALIAS_SINGLE)
{
return (trivertx_t *)
((byte *)paliashdr + paliashdr->frames[frame].frame);
}
paliasgroup = (maliasgroup_t *)
((byte *)paliashdr + paliashdr->frames[frame].frame);
pintervals = (float *)((byte *)paliashdr + paliasgroup->intervals);
numframes = paliasgroup->numframes;
fullinterval = pintervals[numframes-1];
time = cl.time + currententity->syncbase;
// when loading in Mod_LoadAliasGroup, we guaranteed all interval values
// are positive, so we don't have to worry about division by 0
targettime = time - ((int)(time / fullinterval)) * fullinterval;
for (i=0 ; i<(numframes-1) ; i++)
{
if (pintervals[i] > targettime)
break;
}
return (trivertx_t *)
((byte *)paliashdr + paliasgroup->frames[i].frame);
}
/*
================
R_AliasDrawModel
================
*/
void R_AliasDrawModel (alight_t *plighting)
{
static finalvert_t finalverts[MAXALIASVERTS];
static auxvert_t auxverts[MAXALIASVERTS];
trivertx_t *pverts;
// cache align
pfinalverts = finalverts;
paliashdr = (aliashdr_t *)Mod_Extradata (currententity->model);
pmdl = (mdl_t *)((byte *)paliashdr + paliashdr->model);
R_AliasSetupSkin();
R_AliasSetUpTransform(currententity->trivial_accept);
R_AliasSetupLighting(plighting);
pverts = R_AliasSetupFrame ();
if (!currententity->colormap)
fatal ("R_AliasDrawModel: !currententity->colormap");
r_affinetridesc.drawtype = (currententity->trivial_accept == 3) &&
r_recursiveaffinetriangles;
if (r_affinetridesc.drawtype)
D_PolysetUpdateTables (); // FIXME: precalc...
if (currententity != &cl.viewent)
ziscale = (float)0x8000 * (float)0x10000;
else
ziscale = (float)0x8000 * (float)0x10000 * 3.0;
if (currententity->trivial_accept)
R_AliasPrepareUnclippedPoints (pverts, currententity->colormap);
else
R_AliasPreparePoints (pverts, auxverts, currententity->colormap);
}